A Review: Absolute Linear Encoder Measurement Technology

Area of Science:

• Metrology and Measurement Science
• Precision Engineering
• Manufacturing Technology

Background:

• Absolute linear encoders are crucial for high-end manufacturing and precision displacement measurement.
• Key advantages include eliminating homing and retaining position data during power loss.
• A lack of comprehensive review materials hinders practitioners in this field.

Purpose of the Study:

• To provide a systematic review and practical reference for absolute linear encoder measurement technology.
• To address the scarcity of systematic guidance for professionals.
• To clarify technical pathways and challenges in the field.

Main Methods:

• Systematic delineation of three fundamental measurement principles.
• Analysis of the evolutionary trajectory of quasi-absolute and absolute coding technologies.
• Summarization of primary error sources affecting measurement accuracy.

Main Results:

• Categorization of measurement principles and coding technologies (quasi-absolute and absolute).
• Identification and explanation of error sources impacting encoder accuracy.
• Clarification of key technical pathways and current challenges.

Conclusions:

• The study offers a decision-making guide for technology selection and insights into future development.
• Future focus should be on fault-tolerant coding, integrated manufacturing, and error compensation.
• Advancement aims for higher precision, miniaturization, cost reduction, and reliability in encoders.